Beef Burger

Name: Beef Burger
Ingredients: 700 g minced beef; 1 tablespoon tomato paste; 2 tablespoons Worcestershire sauce; 1 egg; sea salt and cracked black pepper; 2 onions, sliced into rings; 4 hamburger buns, halved; 4 lettuce leaves; 8 slices tomato; 4 slices beetroot; condiments, such as mustard or tomato sauce (ketchup), to serve; hot chips, to serve